Title:
RARE EARTH SINTERED NEODYMIUM-IRON-BORON MAGNET, METHOD OF MANUFACTURING THE SAME, AND USE OF HYDROGENATED PRASEODYMIUM
Document Type and Number:
Japanese Patent JP2023081336
Kind Code:
A
Abstract:
To provide a rare earth sintered Nd-Fe-B magnet that attains excellent balance between coercive force and residual magnetism and also has a low residual magnetic flux density temperature coefficient and coercive force temperature coefficient, and a method of manufacturing the same.SOLUTION: A rare earth sintered Nd-Fe-B magnet has an element composition represented as (R1, R2)-T-B-M, and the rare earth sintered Nd-Fe-B magnet is made of a sintered containing main phase crystal grains and a grain boundary phase, wherein: the main phase crystal grains are made of an (R1, R2)2T14B phase; a Pr density C1 of an edge of the main phase crystal grains is higher than a Pr density C2 in the center of the main phase crystal grains; an R1 density of the grain boundary phase is higher than an R1 density of the main phase crystal grains; and an average thickness of the grain boundary phase is 20 to 60 nm. Here, R1 is selected between Nd and Gd, R2 is Pr, T is selected out of Fe, Co and Ni elements, and M is selected out of Al, Cu, Ga, Zn, Bi, Zr, Ti, Nb, V, Mo, and W.SELECTED DRAWING: Figure 1
Inventors:
WU SHUJIE
DONG YI
ZHANG SHUAI
JIA QI
FU YU
YUAN YI
CHEN YA
YUAN WENJIE
DONG YI
ZHANG SHUAI
JIA QI
FU YU
YUAN YI
CHEN YA
YUAN WENJIE
Application Number:
JP2022189055A
Publication Date:
June 09, 2023
Filing Date:
November 28, 2022
Export Citation:
Assignee:
BAOTOU TIANHE MAGNETICS TECH CO LTD
International Classes:
H01F1/057; B22F1/00; B22F1/05; B22F3/00; B22F3/15; B22F9/04; C22C33/02; C22C38/00; H01F41/02
Attorney, Agent or Firm:
Sonoda & Kobayashi Patent Attorneys Corporation
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